This is all very useful, but I'd like to request another metric to add - iowait - it should be fairly trivial to calculate, and would offer a good metric for users with older/slower Hard Drives. One of my test boxes has a very very slow disk, and as such when I'm doing IO intensive actions, the iowait will go up (as viewed via ​https://netdata.io - very useful visuals), while the CPU utilization stays notably low. This would be useful in pointing out slow storage (or other devices).